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US20020162719A1 - Clamping roller overrunning clutch - Google Patents

Clamping roller overrunning clutch Download PDF

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Publication number
US20020162719A1
US20020162719A1 US09/872,694 US87269401A US2002162719A1 US 20020162719 A1 US20020162719 A1 US 20020162719A1 US 87269401 A US87269401 A US 87269401A US 2002162719 A1 US2002162719 A1 US 2002162719A1
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US
United States
Prior art keywords
overrunning clutch
clamping
shaft
bevel
clamping rollers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
US09/872,694
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US6561334B2 (en
Inventor
Johann Stark
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
INA Waelzlager Schaeffler OHG
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to INA WALZLAGER SCHAEFFLER OHG reassignment INA WALZLAGER SCHAEFFLER OHG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STARK JOHANN
Publication of US20020162719A1 publication Critical patent/US20020162719A1/en
Application granted granted Critical
Publication of US6561334B2 publication Critical patent/US6561334B2/en
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG MERGER AND CHANGE OF NAME Assignors: Schaeffler Technologies AG & Co. KG, SCHAEFFLER VERWALTUNGS 5 GMBH
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CORRECTIVE ASSIGNMENT TO CORRECT THE PROPERTY NUMBERS PREVIOUSLY RECORDED ON REEL 037732 FRAME 0347. ASSIGNOR(S) HEREBY CONFIRMS THE APP. NO. 14/553248 SHOULD BE APP. NO. 14/553258. Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
    • F16D41/066—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical
    • F16D41/067—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical and the members being distributed by a separate cage encircling the axis of rotation

Definitions

  • the invention concerns an overrunning clutch for receiving a shaft, said overrunning clutch comprising an outer ring having clamping surfaces, a cage for guiding clamping rollers and comprising spring elements for suspending the clamping rollers being arranged in the outer ring.
  • An overrunning clutch of the pre-cited type configured as a sleeve-type overrunning clutch is known from DE 42 10 560 C2.
  • This overrunning clutch comprises a chiplessly shaped sleeve having a rim.
  • An inner peripheral surface of the sleeve comprises clamping ramps against which spring-loaded clamping needle rollers guided in a cage bear in the clamped state.
  • edge abrasion i.e. a life-reducing overloading of end regions of the clamping rollers
  • the two opposite end faces of the clamping needle rollers are slightly rounded.
  • a drawback of this is that, despite this diameter reduction in the end regions of the clamping rollers, assembly problems can arise during automatic assembly. Particularly in the case of a very sharp-edged shaft, the end face of the shaft can collide against the end faces of the clamping rollers when being pushed in axially. Even when rotated in overrunning direction, not all the clamping rollers are turned out of the clamping gaps, so that a trouble-free automatic assembly is not possible. This is due to the fact that in the unassembled state, the springs for the clamping needle rollers press them against the next crossbar or against the next needle retaining element with the result that the clamping contour presses the clamping needles or rollers radially inwards.
  • the enveloping circle diameter of the unassembled overrunning clutch is smaller than the diameter of the shaft.
  • DE-OS 16 25 743 describes a clamping roller overrunning clutch in which trumpet-like pegs are arranged on the opposite ends of the clamping rollers.
  • these pegs have nothing at all to do with the assembly of the overrunning clutch arrangement but only prevent the clamping rollers from falling out inwards in radial direction.
  • DE-OS 25 14 767 and DE 24 38 007 C2 disclose overrunning clutches whose clamping rollers have a reduced diameter in their end regions.
  • the purpose is only the retention of the rollers.
  • the invention achieves the above objects by the fact that the clamping rollers comprise a bevel on at least one end face so that in an uninstalled state of the shaft, the enveloping circle diameter D HK at an outer end of the frustum is equal to or larger than the diameter D W of the shaft.
  • the bevel may be configured with a frustoconical, convex, concave or any other desired shape.
  • the bevel is inclined at an angle of 60 to 75° to the end face of the clamping roller. This assures that as little as possible of the axial clamping surface is lost.
  • FIG. 1 is a longitudinal cross-section through a sleeve-type overrunning clutch
  • FIG. 2 is a side view of the sleeve-type overrunning clutch of FIG. 1 in partial section
  • FIG. 3 is a schematic representation of the radial dimension relationship between the clamping rollers and the shaft to be introduced
  • FIG. 4 is an enlarged partial representation of a clamping roller.
  • FIGS. 1 and 2 show the structure of the sleeve-type overrunning clutch 1 whose chiplessly shaped sleeve 2 comprises radially inward oriented rims 3 and 4 at each end.
  • the cage 5 that receives the clamping rollers 6 is arranged between the rims 3 and 4 .
  • Spring elements 8 serving to suspend the clamping rollers 6 are fixed on the crossbars 7 of the cage 5 .
  • the opposite ends of the clamping rollers 6 comprise frustoconical bevels 9 whose enveloping circle diameter D HK at the end of the clamping rollers 6 is larger than the diameter D W of the shaft 10 , so that the shaft 10 can be inserted without obstruction into the reception opening of the cage 5 defined by the clamping rollers 6 and the crossbars 7 .
  • the clamping rollers 6 are displaced radially outward by the shaft 10 toward the inner peripheral surface of the sleeve 2 .
  • the frustoconical bevel 9 extends at an angle of inclination ⁇ to the end face of the clamping roller 6 . It can be seen that with an increasing angle ⁇ , the peripheral surface of the clamping roller 6 available for clamping becomes smaller. With a smaller angle of inclination ⁇ 1 , the peripheral line extends up to the point A, while with a larger angle of inclination ⁇ 2 , this line extends only up to the point B, i. e. it is shorter.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
  • Springs (AREA)
  • Pulleys (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

The invention concerns an overrunning clutch for receiving a shaft (10), said overrunning clutch comprising an outer ring having clamping surfaces, a cage (5) equipped with clamping rollers (6) and spring elements (8) for suspending the clamping rollers (6) being arranged in the outer ring. The clamping rollers (6) comprise a frustoconical bevel (9) on at least one end face, so that when the shaft (10) is not inserted, the enveloping circle diameter DHK of the conic frustum at its outer end is equal to or larger than the diameter DW of the shaft (10). This enables an automatic assembly of the entire overrunning clutch because the shaft (10) can be inserted without any problem into the cage (5).

Description

    FIELD OF THE INVENTION
  • The invention concerns an overrunning clutch for receiving a shaft, said overrunning clutch comprising an outer ring having clamping surfaces, a cage for guiding clamping rollers and comprising spring elements for suspending the clamping rollers being arranged in the outer ring. [0001]
    • BACKGROUND OF THE INVENTION
  • An overrunning clutch of the pre-cited type configured as a sleeve-type overrunning clutch is known from DE 42 10 560 C2. This overrunning clutch comprises a chiplessly shaped sleeve having a rim. An inner peripheral surface of the sleeve comprises clamping ramps against which spring-loaded clamping needle rollers guided in a cage bear in the clamped state. To avoid so-called edge abrasion, i.e. a life-reducing overloading of end regions of the clamping rollers, the two opposite end faces of the clamping needle rollers are slightly rounded. [0002]
  • A drawback of this is that, despite this diameter reduction in the end regions of the clamping rollers, assembly problems can arise during automatic assembly. Particularly in the case of a very sharp-edged shaft, the end face of the shaft can collide against the end faces of the clamping rollers when being pushed in axially. Even when rotated in overrunning direction, not all the clamping rollers are turned out of the clamping gaps, so that a trouble-free automatic assembly is not possible. This is due to the fact that in the unassembled state, the springs for the clamping needle rollers press them against the next crossbar or against the next needle retaining element with the result that the clamping contour presses the clamping needles or rollers radially inwards. As a result, the enveloping circle diameter of the unassembled overrunning clutch is smaller than the diameter of the shaft. When the shaft is pushed in axially, a collision takes place between the shaft and the clamping rollers and this can lead to a destruction of the cage or of the entire overrunning clutch arrangement. [0003]
  • In this connection, other clamping rollers likewise having a diameter reduction in their end regions are also known. Thus, for example, DE-OS 16 25 743 describes a clamping roller overrunning clutch in which trumpet-like pegs are arranged on the opposite ends of the clamping rollers. However, these pegs have nothing at all to do with the assembly of the overrunning clutch arrangement but only prevent the clamping rollers from falling out inwards in radial direction. Even DE-OS 25 14 767 and DE 24 38 007 C2 disclose overrunning clutches whose clamping rollers have a reduced diameter in their end regions. Here, too, the purpose is only the retention of the rollers. [0004]
    • OBJECTS OF THE INVENTION
  • It is therefore an object of the invention to provide a clamping roller overrunning clutch that enables an automatic assembly with the associated shaft without difficulty. [0005]
  • This and other objects and advantages of the invention will become more obvious from the following detailed description. [0006]
    • SUMMARY OF THE INVENTION
  • The invention achieves the above objects by the fact that the clamping rollers comprise a bevel on at least one end face so that in an uninstalled state of the shaft, the enveloping circle diameter D[0007] HK at an outer end of the frustum is equal to or larger than the diameter DW of the shaft. Through this inventive radial matching of the clamping roller and the shaft, it is guaranteed that the shaft can be pushed in between the clamping rollers without obstruction and, in doing so, presses the clamping rollers radially outward against the inner peripheral surface of the outer ring of the overrunning clutch.
  • According to a further proposition of the invention, the bevel may be configured with a frustoconical, convex, concave or any other desired shape. In this connection, it is also conceivable to configure the bevel with a combination of straight and curved lines. [0008]
  • Finally, according to another advantageous feature of the invention, the bevel is inclined at an angle of 60 to 75° to the end face of the clamping roller. This assures that as little as possible of the axial clamping surface is lost. [0009]
  • The invention will now be elucidated with reference to one example of embodiment described below.[0010]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a longitudinal cross-section through a sleeve-type overrunning clutch, [0011]
  • FIG. 2 is a side view of the sleeve-type overrunning clutch of FIG. 1 in partial section, [0012]
  • FIG. 3 is a schematic representation of the radial dimension relationship between the clamping rollers and the shaft to be introduced, and [0013]
  • FIG. 4 is an enlarged partial representation of a clamping roller. [0014]
    • DETAILED DESCRIPTION OF THE DRAWINGS
  • FIGS. 1 and 2 show the structure of the sleeve-[0015] type overrunning clutch 1 whose chiplessly shaped sleeve 2 comprises radially inward oriented rims 3 and 4 at each end. The cage 5 that receives the clamping rollers 6 is arranged between the rims 3 and 4. Spring elements 8 serving to suspend the clamping rollers 6 are fixed on the crossbars 7 of the cage 5.
  • As can be seen in FIG. 3, the opposite ends of the [0016] clamping rollers 6 comprise frustoconical bevels 9 whose enveloping circle diameter DHK at the end of the clamping rollers 6 is larger than the diameter DW of the shaft 10, so that the shaft 10 can be inserted without obstruction into the reception opening of the cage 5 defined by the clamping rollers 6 and the crossbars 7. During insertion of the shaft 10, the clamping rollers 6 are displaced radially outward by the shaft 10 toward the inner peripheral surface of the sleeve 2.
  • As shown in the enlarged representation of the [0017] clamping roller 6 in FIG. 4, the frustoconical bevel 9 extends at an angle of inclination α to the end face of the clamping roller 6. It can be seen that with an increasing angle α, the peripheral surface of the clamping roller 6 available for clamping becomes smaller. With a smaller angle of inclination α1, the peripheral line extends up to the point A, while with a larger angle of inclination α2, this line extends only up to the point B, i. e. it is shorter.

Claims (6)

1. An overrunning clutch for receiving a shaft, said overrunning clutch comprising an outer ring having clamping surfaces, a cage equipped with clamping rollers and spring elements for suspending the clamping rollers being arranged in the outer ring, wherein the clamping rollers comprise a bevel on at least one end face, so that in absence of an installed shaft, an enveloping circle diameter DHK at an outer end of a frustum of the bevel is equal to or larger than a diameter DW of the shaft.
2. An overrunning clutch of claim 1, wherein the bevel has a frustoconical shape.
3. An overrunning clutch of claim 1, wherein the bevel has a convex shape.
4. An overrunning clutch of claim 1, wherein the bevel has a concave shape.
5. An overrunning clutch of claim 1, wherein the bevel has any desired shape.
6. An overrunning clutch of claim 1, wherein the bevel is inclined at an angle α of 60 to 75° to the end face of the clamping rollers.
US09/872,694 2000-06-02 2001-06-01 Clamping roller overrunning clutch Expired - Lifetime US6561334B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20009895U 2000-06-02
DE20009895.0 2000-06-02
DE20009895U DE20009895U1 (en) 2000-06-02 2000-06-02 Pinch roller overrunning clutch

Publications (2)

Publication Number Publication Date
US20020162719A1 true US20020162719A1 (en) 2002-11-07
US6561334B2 US6561334B2 (en) 2003-05-13

Family

ID=7942362

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/872,694 Expired - Lifetime US6561334B2 (en) 2000-06-02 2001-06-01 Clamping roller overrunning clutch

Country Status (3)

Country Link
US (1) US6561334B2 (en)
EP (1) EP1160473A3 (en)
DE (1) DE20009895U1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003083426A (en) * 2001-09-11 2003-03-19 Nsk Ltd Pulley device with built-in roller clutch and assembly method thereof
RU2222727C2 (en) * 2002-04-11 2004-01-27 Ярославский государственный технический университет Roller-type overrunning clutch
DE102004040341A1 (en) * 2004-08-20 2006-02-23 Ina-Schaeffler Kg Rolling bearing comprising at least one precision deep-drawn component with a running or guiding surface for rolling elements, and method for producing such a component
KR101347414B1 (en) 2006-02-18 2014-01-02 섀플러 테크놀로지스 아게 운트 코. 카게 Roller freewheel
DE102007040156B4 (en) 2007-08-24 2013-08-29 Shimano Inc. Rear bicycle derailleur
DE102008059306A1 (en) * 2007-12-07 2009-06-10 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Punched inner and outer rings
EP2237841B1 (en) 2008-01-22 2018-06-20 AMOVA S.à.r.l Crash safety device having a rope drive mechanism
US8852041B2 (en) 2010-09-30 2014-10-07 Shimano, Inc. Bicycle derailleur with rotation resistance
US8870692B2 (en) 2010-09-30 2014-10-28 Shimano, Inc. Bicycle derailleur with rotation resistance

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973847A (en) * 1958-01-02 1961-03-07 Ford Motor Co Overrunning coupling
US3241641A (en) * 1963-10-10 1966-03-22 Torrington Co Over-running roller clutch with resilient metal cage
DE1625743A1 (en) 1967-09-27 1972-04-06 Schaeffler Ohg Industriewerk Pinch roller overrunning clutch
US3815836A (en) * 1971-02-11 1974-06-11 Barmag Barmer Maschf Sleeve chuck for thread winding device
US3863742A (en) 1973-08-08 1975-02-04 Torrington Co Retainer for overrunning clutch
US3942616A (en) 1974-04-05 1976-03-09 The Torrington Company Overrunning clutch and retainer
US3937311A (en) * 1974-05-20 1976-02-10 The Torrington Company Overrunning clutch
DE3241053A1 (en) 1982-11-06 1984-05-10 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Plastic cage for a wedging-roller freewheel
DE3345827A1 (en) 1983-12-17 1985-06-27 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Thin-walled outer sleeve, in particular an outer sleeve drawn from sheet metal, for a one-way roller clutch
US4815577A (en) 1987-11-13 1989-03-28 General Motors Corporation Roller clutch with protected and guided energizing springs
JP2807722B2 (en) 1990-08-03 1998-10-08 光洋精工株式会社 One-way clutch
DE4210560C2 (en) 1992-03-31 1998-04-09 Schaeffler Waelzlager Kg Sleeve freewheel
JPH08326786A (en) 1995-06-01 1996-12-10 Nsk Warner Kk Roller type one-way clutch

Also Published As

Publication number Publication date
EP1160473A3 (en) 2003-09-24
DE20009895U1 (en) 2000-11-23
EP1160473A2 (en) 2001-12-05
US6561334B2 (en) 2003-05-13

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